Boat-hull construction



Nov 25, 1930.

H. B. GREENING BOAT HULL CONSTRUCTION Filed Dec. 14. 1929 lam/enter. Hera/d B. Green 1'73.

I all/zany "avail/5x Patented Nov. 25, 1930 i UNI STATES PATE Q IC H HERALD B. GREENING, or iiAMILTon, ammo, oAimnA, Assa ese GA LLO WL A Y V'ENGINEERING, COMPANY LIMITED, or HAMILTON, O TARIO, CANADA BOA'IA-HIUIQQL. oons'rnuorrroiv 1 Application filed December 14, 1929. Serial m. 414,olso.

The principal objectsof this invention are to obviate the'very serious difficulties met with in small racing craft and aeroplane po n toons through the shearing of the bottoms at the transom, step orcross frames and topro vide a hull construction which will be very light in weight yet extremely strong and rigid and which Willenable the use of very thin bottoms with safety. @The principal features of the invention consist in the novel construction of thehull frame in which aplurality of rigid longitudinal members are spaced apart and rigidlyconnected by transverse members-arranged intermediateof the depth thereof and a thin bottomhis supported by said longitudinal members free from contact with said rigid transverse members 1 r In the accompanying v drawings, Figure 1 is a side elevational view of a stepped type of: pontoon orspeed boat hull.

,Fi'gUre 2is an enlargedcross sectional view through a hull constructed in accord-v ance with this invention, taken lon the line ie-2'01 Figure 3. a p i Figurefi is a longitudinal sectionalview of taken on the line;

the rear end "of the hull 3-3 of Figure 2. 3 A

The history of-the ifailureof racing boat hullsl to withstand the tremendous stresses to which they aresubjected has shown conclusively that the pounding of the boat, runningat high speeds, against the water shears the bottom plankingwhere it is supported by 1 rigid cross frames where the bending stresses concentrate and if the bottom planking is made strong enough to eitectively resist such stresses the weights are abnormal and detrimental for obtaining high speeds and are lized.

In the construction of 'a hull as herein shown the-outside walls or chines A are formed of planks of a depth suitable for the "craft designed and these may be comparatively thin. These outside walls are spaced apart and rigidly supported bya plurality of rigid tortional c'rossunembers B, here shown formed of metal tubinghavingflanged ends C which are firmlybolted tothe side members A, with metal places D arranged on a the outer face. The tubular cross members may be of a fairly light gauge metal but be ing of comparatively large diameter will be extremely rigid andthe frame thus formed will effectively resist twisting strains. j

One or more intermediate longitudinals E similar to the side walls Amay be supported on thecross members B, the said cross inem bers extending through holes bored insame and flange rings F mounted on the cross members and bolted through the members F may be used if desired; a

In; motor boat construction the central longitudinals F :will form the engine bear ings supports and the weight of the engine will be distributed over the entire: frame structurew M* The'bottom may be of any desirable thin ply-wood or cemented veneertype and extends betweenthe sidewalls A and the longi tudinals E and is secured to same by screws or rivets H which arespaced Well apart to avold, as much as possible, the fracturing" of the fibreof the bottonimaterial;

The crossmembers, in the form of the transom -J,-and:step frame K are arranged with theirwbottom edges spaced above the line of the bottom edges of the longitudinal mem- I bers and the bottoin'sheet G is sealed across the hull strips L of soft rubber which are placed in position under sufiicient compression to renderthe hull water-tight; The soft rubber contact members will permitthe. bottom sheet to fiGX without being: subj ect to the shear resulting from the bottom being secured a to-a rigid cross member. i v a i l A hull contraction such as herein described may be built extremely light in weight but will be very rigid and strong and the-bottom which is rigidly secured to the longitudinals is free to flex between said longitudinals to relieveand distribute the stresses in such a manner that shearing oflthebottomsheet will be entirely avo1ded,the .rubber'cushions arranged between the rigid cross frames and the bottom presenting no shearing base against which the stresses may fracture the bottom sheet.

An important feature of the construction herein described is that the cost will be very materially reduced.

It will be readily apparent that a structure such as described will be very applicable to the contruction of aeroplanes pontoons, which require to be very light but are subjected to very heavy stresses in striking the water at a high rate of speed in landing and also in travelling over the water at very high speeds in taking oil.

WVhat I claim as my invention is 1. A boat hull comprising longitudinal members spaced apart, a flexible bottom supported by said longitudinal members, and

. transverse members arranged clear of the bottom and rigidly supporting said longitudinal members.

2. A boat hull comprising longitudinal members spaced apart, a flexible bot-tom secured to the bottom edges of said longitudinal members, and rigid transverse members arranged clear of the bottom and supporting said longitudinal members in their spaced relation.

3. A boat hull comprising longitudinal side members, rigid transverse tortional mem bers extending between and rigidly secured to said side members intermediate of their depth, and a flexible bottom rigidly secured to the bottom edges of said side members.

4. A boat hull comprising longitudinal side members, rigid transverse tortional members extending between and rigidly secured to said side members intermediate of their depth, a flexible bottom rigidly secured to the bottom edges of said side members, closure members extending between said side members to complete the hull, and resilient sealing means arranged between the bottom and said closure members.

5. A boat hull, comprising longitudinal members spaced apart, rigid members secured to said longitudinal members and extending therebetween above the plane of their bottom edges, a bottom sheet rigidly secured to said longitudinal members, and resilient means interposed between the bottom sheet at its terminal edge and a rigid cross member of the hull.

6. A boat hull, comprising longitudinal members spaced apart, rigid members secured to said longitudinal members and extending therebetween above the plane of their bottom edges, a bottom sheet rigidly secured to said longitudinal members, and a strip of soft rubber sealing the bottom sheet at its, transverse terminal edge.

7. A boat hull, comprising longitudinal members spaced apart forming the side walls of the hull, rigid brace members extending transversely of the hull and secured at their ends to said side walls above their bottom edges, a bottom extending between the longitudinal side walls and engaging only their bottom edges and secured thereto, transverse hull members extending between and secured to the side walls and spaced from the bottom, and resilient packing strips compressed between said bottom and said transverse members spaced therefrom.

8. A boat hull, comprising longitudinal members spaced apart, metal tubes arranged transversely between and rigidly connecting said longitudinal members above their bottom edges, a bottom secured to the bottom edges of said longitudinal members, transverse members closing the hull between the ends of said longitudinal members, and rcsilient sealing means interposed between said end closing members and said bottom.

9. A boat hull, comprising longitudinal members spaced apart, metal tubes flanged at the ends extending transversely between said longitudinal members and having the flanges thereof rigidly secured th creto, a flexible bottom sheet rigidly secured to the bottom edges of said longitudinals, transverse members closing the hull, and a resilient packing arranged between the bottom and the lower edges of said closing members.

10. A boat hull, comprising a bottom. a pair of thin fiat side members having their bottom edges secured to said bottom and extending longitudinally thereof, a rigid transverse member secured between said thin flat members and closing the hull having the bottom spaced from the hull bottom a resilient packing between said bottom and said closmg member, rigid transverse members sooured to said side members intermediate of their height, and longitudinal members sup ported by said rigid transverse members and secured to said bottom intermediate of its width.

HERALD B. GREENING. 

